JSP example - Google Recaptcha validation using jquery (AJAX)

validateRecaptcha.jsp

<%@ page import="net.tanesha.recaptcha.ReCaptchaImpl,net.tanesha.recaptcha.ReCaptchaResponse" %><%

  ReCaptchaImpl reCaptcha = new ReCaptchaImpl();
	reCaptcha.setPrivateKey("your_private_key");
	
	String remoteip = request.getParameter("remoteip");
	String challenge = request.getParameter("challenge");
	String res = request.getParameter("response");
	ReCaptchaResponse reCaptchaResponse = reCaptcha.checkAnswer(remoteip, challenge, res);
	
	if (reCaptchaResponse.isValid()) {
	  out.print("true");
	} else {
	  out.print("false");
	}
%>